user
Instruction: Create a computer program to output all the possible combinations that can be made from the following letters: GDHAC
Output:
assistant
G, D, H, A, C, GD, GH, GA, GC, DH, DA, DC, HA, HC, AC, GHD, GHA, GHC, GDA, GDC, GHA, GHC, GAC, DHA, DHC, DAC, HDA, HDC, HAC, DAC.